Protect furniture from marks and discoloration from the condensation on drinking glasses with these Flexible Rubber Drink Coasters by Spectrum Diversified Designs. These drink coasters are constructed from durable rubber and features rasied bumps on the surface to keep your drinking glass firmly in place and allow condesation to roll off the glass and safely onto the coaster. Rubber Beverage Coaster Set Features Protects furniture from being damaged by condensation from drinking glasses. Raised bumps allow condensation to drain safely into the coaster. Durable rubber construction provides lasting quality and performance. Stacks neatly for compact convenient storage. Black rubber matches most interior decor. Easy to clean dishwasher safe.